by pimp daddy dollars January 3, 2007

an imaginary musical note, which, under ideal circumstances, does not exist; a J# (jay sharp) is any musical note that should be played # (sharp) according to the key signature of the musical selection, but is (unintentionally) played as natural by the player, which will oftentimes be young and inexperienced, or careless.
Frustrated by the number of missed key signature notes, the director yells, "Don't forget your J#s!"
by Nicolae Stiurca September 26, 2005

by RBG5 November 4, 2010

Some friggin awesome basketball shoes. And people, you use the term 'j' mostly to describe shoes, not joints.
by 360headturn October 18, 2007

by ~Dark.1~ January 8, 2005

by johnny123456789101112 October 4, 2008
